Shop 4,474 Deals on Upper Receivers

Heckler and Koch MR556 A4 Upper Receiver/Barrel Assembly 5.56 11 Barrel

Sons of Liberty Gun Works East India Starter Kit Combat Grade 16in 5.56mm Black

Radian Weapons Model 1 Builder Kit OD Green 5.56 14 MLOK Handguard

Battle Arms Development WORKHORSE

Battle Arms Development Authority Elite

Battle Arms Development Authority Elite, Complete Upper Receiver, 556NATO, 10.5 in Barrel, Fits AR-15, M-Lok Handguard, Anodized Finish, Sniper Gray, Includes Bad Rack-15 C Ambidextrous Charging Handle and AR15/M16 BCG BAD-AUTH-UR10.5G-Y-15C

Tactical Solutions X-RING VR .22lr Upper Receiver, Matte Black - XRA-MB

Holosun 403 Micro Sight, Dot Reticle w/ Solar & Shake Awake - HS403C

Tactical Solutions X-Ring Takedown VR .22lr Upper Receiver, Quicksand - XRATD-QS

Aero Precision M4E1 Threaded Stripped Upper Receiver 5.56 NATO

Aero Precision EPC-9 Threaded Upper Receiver, Black

Aero Precision M5 Stripped Upper Receiver, Black

Sig Sauer MCX SURG 5.56x45mm Suppressed Upper Receiver Kit w/ Folding Stock & Adapter (NFA) UAMCXA-SURG

Rise Armament 18" Upper .22 ARC 1:7 M-LOK Picatinny Rail Aluminum Rifle-Length, Patriot Brown

Aero Precision M4E1 Enhanced Upper Receiver Black 5.56 / .223 Rem

Daniel Defense DD5 V4 20" Upper 6.5 Creedmoor 1:8 M-LOK Rifle-Length, Black

Angstadt Arms Vanquish-9 Upper 9mm 16 Barrel Integrally Suppressed

Aero Precision AR15 Complete Upper 5.56 / .223 Rem 16 Barrel

Aero Precision Enhanced Assembled Upper Receiver, Black

Midwest AR-15 Upper, 16" Lightweight Barrel, 223 Wylde, No BCG or Charging Handle - MIN16CRM15U

Rise Armament 18" Upper 6mm ARC 1:7 M-LOK Picatinny Rail Aluminum Rifle-Length, Patriot Brown

Daniel Defense DD4 RIII 16" Upper 5.56x45mm 1:7 M-LOK Mid-Length, Flat Dark Earth

Daniel Defense AR15 14.5" 5.56 NATO M4A1 RIII URG, FDE

Tactical Solutions X-RING VR .22lr Upper Receiver, Gun Metal Gray - XRA-GMG